We had a dog that was deaf. He belonged to MIL so we had know him all of his life. It seemed as if he went totally deaf almost overnight.
It was rather difficult to locate him outside. There are only a couple of acres that he had access to but there were lots of shrubs, small evergreens and other neat places that he lovedto nap in. We bought a little remote device that we put on his collar that beeped and blinked when we pressed the button so that we could find him when it was time to go in. The only problem... you had to be within 15 feet for the remote to work. Lots of walking and button pushing but it worked. He also knew certain gestures if he happened to see me.
Joy